API PREVENT ALGAE Aquarium Algae Control prevents aquarium algae by removing phosphate, which contributes to algae growth. Regular use prevents green water and helps keep the aquarium clean. Use weekly to limit algae growth. API PREVENT ALGAE Aquarium Algae Control is safe for all aquarium inhabitants, including fish, plants, corals and invertebrates. Tips: In freshwater aquariums, keeping a few algae eating fish, such as Otocinclus, will help control algae growth. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.